that's a tough one.
it sounds to me like your woodriff key is loose, broken or missing.
cam and crank gear keeper bolts
could be coming loose or stripped.
may even be a bad cam shaft bearing.
or a crank shaft bearing.
oh. chain could be wrong size as well.
valve springs to stiff/not worn in maybe? they could be causing the cam to bind a little so the crank's compression is just yanking on the chain causing it to jump.
I'm sorry, you need to specify more info.. like, How do you know its the timing chain or belt (did not specify engine type) etc..
It won't jump time! (but once) Then it quites and most likely wipes out some valves in the process. Makes no difference if it is a overhead cam with a timing belt or an in block camshaft driven by gears or a timing chain set. Once it jumps time that's it until it' repaired. The cam and crank are either in time or they aren't. I resently repaired a 5.0L Ford (302 V-8) that had a problem like this and it turned out to be the distributor. The rotor drive flang on top of the distributor drive shaft that is timed to that camshaft and holds the "rotor button" had a broken weld and it would "skip" around the shaft on start ups and get to a point of out of time where it would not start or quite when being driven on the road. You could re-time the distributor and it would start and run fine for a short while then do it again. I finally took the cap back off and took hold of the rotor drive flang, minus the rotor button, with a large pair of "water pump" slip joint pliers and found I could rotate the rotor drive flang of the distributor shaft back and forth. Not " a good thing", at all! A reman'ed distributor from the Zone repaired it and she runs like a top. This sound more like the problem your asking about. There is not much probibility, AT ALL, your timing chain is actually "jumping" time. If it were to it would just quite and not crank again.
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